Mercurial > cpython-lru_cache-weakref

annotate Python/thread_lwp.h @ 69888:8752a81ada2d

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faulthandler: dump all threads by default * Set the default value of all_threads arguments to True * Py_FatalError() dumps all threads, instead of only the current thread Dump only the current thread is not reliable. In some cases, Python is unable to retrieve the state of the current thread and so is unable to dump the traceback. faulthandler keeps a reference to the interpreter and so is always able to dump the traceback of all threads.
author Victor Stinner <victor.stinner@haypocalc.com>
date Sat, 07 May 2011 12:43:00 +0200
parents 3c9232a684ae
children
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1
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2 #include <stdlib.h>
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3 #include <lwp/lwp.h>
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4 #include <lwp/stackdep.h>
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5
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6 #define STACKSIZE 1000 /* stacksize for a thread */
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7 #define NSTACKS 2 /* # stacks to be put in cache initially */
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8
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9 struct lock {
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10 int lock_locked;
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11 cv_t lock_condvar;
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12 mon_t lock_monitor;
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13 };
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14
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15
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16 /*
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17 * Initialization.
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18 */
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19 static void PyThread__init_thread(void)
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20 {
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21 lwp_setstkcache(STACKSIZE, NSTACKS);
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22 }
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23
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24 /*
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25 * Thread support.
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26 */
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29 long PyThread_start_new_thread(void (*func)(void *), void *arg)
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30 {
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31 thread_t tid;
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32 int success;
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33 dprintf(("PyThread_start_new_thread called\n"));
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34 if (!initialized)
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35 PyThread_init_thread();
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36 success = lwp_create(&tid, func, MINPRIO, 0, lwp_newstk(), 1, arg);
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37 return success < 0 ? -1 : 0;
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38 }
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39
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40 long PyThread_get_thread_ident(void)
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41 {
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42 thread_t tid;
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43 if (!initialized)
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44 PyThread_init_thread();
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45 if (lwp_self(&tid) < 0)
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46 return -1;
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47 return tid.thread_id;
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48 }
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49
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50 void PyThread_exit_thread(void)
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51 {
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52 dprintf(("PyThread_exit_thread called\n"));
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53 if (!initialized)
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54 exit(0);
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55 lwp_destroy(SELF);
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56 }
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57
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58 /*
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59 * Lock support.
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60 */
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61 PyThread_type_lock PyThread_allocate_lock(void)
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62 {
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63 struct lock *lock;
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64 extern char *malloc(size_t);
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66 dprintf(("PyThread_allocate_lock called\n"));
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67 if (!initialized)
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68 PyThread_init_thread();
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69
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70 lock = (struct lock *) malloc(sizeof(struct lock));
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71 lock->lock_locked = 0;
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72 (void) mon_create(&lock->lock_monitor);
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73 (void) cv_create(&lock->lock_condvar, lock->lock_monitor);
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74 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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75 return (PyThread_type_lock) lock;
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76 }
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78 void PyThread_free_lock(PyThread_type_lock lock)
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79 {
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80 dprintf(("PyThread_free_lock(%p) called\n", lock));
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81 mon_destroy(((struct lock *) lock)->lock_monitor);
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82 free((char *) lock);
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83 }
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84
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85 int PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
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86 {
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87 int success;
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88
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89 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
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90 success = 0;
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91
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92 (void) mon_enter(((struct lock *) lock)->lock_monitor);
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93 if (waitflag)
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94 while (((struct lock *) lock)->lock_locked)
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95 cv_wait(((struct lock *) lock)->lock_condvar);
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96 if (!((struct lock *) lock)->lock_locked) {
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97 success = 1;
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98 ((struct lock *) lock)->lock_locked = 1;
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99 }
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100 cv_broadcast(((struct lock *) lock)->lock_condvar);
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101 mon_exit(((struct lock *) lock)->lock_monitor);
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102 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
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103 return success;
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104 }
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105
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106 void PyThread_release_lock(PyThread_type_lock lock)
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107 {
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108 dprintf(("PyThread_release_lock(%p) called\n", lock));
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109 (void) mon_enter(((struct lock *) lock)->lock_monitor);
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110 ((struct lock *) lock)->lock_locked = 0;
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111 cv_broadcast(((struct lock *) lock)->lock_condvar);
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112 mon_exit(((struct lock *) lock)->lock_monitor);
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113 }